Barely larger than Manhattan, Liechtenstein is the world’s sixth-smallest country. It’s an unassuming place squashed between Switzerland and Austria, ruled over by His Serene Highness Prince Hans Adam II, and has made a mint from nursing some Fr.90 billion in numbered bank accounts. The main reason to visit is the novelty value – you can see the whole country in an easy day-trip from Zürich, less than two hours away by train. Swiss francs are legal tender, but the phone system is separate (country code 423).